virttest.qemu_vm: Remove media=floppy

media accepts only disk or cdrom. Use media='' to ignore it even in
strict_mode. (strict_mode sets media=disk when media is None)

Signed-off-by: Lukáš Doktor <ldoktor@redhat.com>
virttest.qemu_vm: Ignore image_format for floppies

image_format is usually set for images. Floppies usually use raw so
we'd have to either set image format for floppies or we can simply
ignore it (this solution).

Signed-off-by: Lukáš Doktor <ldoktor@redhat.com>
virttest.qemu_devices: Fix floppies handling on old qemu

Old qemu without -global support must use -drive index=n
to set the floppy slot.

Signed-off-by: Lukáš Doktor <ldoktor@redhat.com>
Merge pull request #858 from ldoktor/framework2

virttest.qemu_devices: Fix floppy issues